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- W4313385276 abstract "Abstract Th17 cells are important for protective immunity as well as tissue inflammation and autoimmune disorders. Treg cells, including induced Treg (iTreg) and natural Treg (nTreg), play a critical role in immune tolerance. RhoA of the Rho small GTPase family is an intracellular signal transducer that cycles between an inactive GDP-bound form and an active GTP-bound form. We have previously reported that RhoA plays an important role in Th2 cell differentiation by regulating glycolysis. In this study, we further examined the role of RhoA in Th17 and Treg cell differentiation. Genetic deletion of RhoA in T cells or pharmacologic inhibition of RhoA by a RhoA-specific inhibitor Y16 led to reduced Th17 differentiation in vitro as evidenced by reduction of Th17 effector cytokines, transcriptional downregulation of RORγT and reduced phosphorylation of Stat3. Accordingly, RhoA deficiency ameliorated house dust mites (HDM)-induced allergic airway inflammation and dextran sodium sulphate (DSS)-induced colitis in vivo where Th17 cells plays an important role. Inhibition of ROCK, an immediate downstream effector of RhoA, recapitulated the effect of RhoA deficiency or inhibition on Th17 differentiation, suggesting that RhoA regulates Th17 cell differentiation through ROCK. On the other hand, ablation of RhoA had no effect on iTreg cell differentiation. However, inhibition of ROCK enhanced iTreg differentiation, suggesting that ROCK has RhoA-independent role in iTreg differentiation. In contrast to its in-effect on iTreg differentiation, RhoA deficiency increased nTreg differentiation. Thus, our data have provided new insights into Th17 and Treg differentiation and identified RhoA as a potential therapeutic target for tissue inflammation." @default.
- W4313385276 created "2023-01-06" @default.
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- W4313385276 date "2017-05-01" @default.
- W4313385276 modified "2023-09-29" @default.
- W4313385276 title "Reciprocal regulation of Th17 and Treg cell differentiation by RhoA" @default.
- W4313385276 doi "https://doi.org/10.4049/jimmunol.198.supp.150.3" @default.
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